mapserver: MapServer is a system for developing web-based GIS applications
CVE-2026-45104 is fixed in mapserver on 1 platform by DEBIAN-CVE-2026-45104 (version 8.6.3-1), released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.
MapServer is a system for developing web-based GIS applications. From 6.4.0 to before 8.6.3, msSLDParseUserStyle always calls _SLDApplyRuleValues(psRule, psLayer, 1); for any <Rule> carrying <ElseFilter/> — it assumes msSLDParseRule added one class. When the rule has no symbolizer (a structurally valid SLD), msSLDParseRule adds zero, and _SLDApplyRuleValues ends up indexing _class[-1], resulting in a NULL pointer dereference. A 200-byte well-formed SLD via the WMS SLD_BODY= parameter is enough to trigger this, no auth required. This vulnerability is fixed in 8.6.3.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mapserver · Debian 14 | 8.6.3-1 | DEBIAN-CVE-2026-45104 | Jun 24, 2026 |
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